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Peptidoglycan

Microbiology Chapter 5 Notes Powerpoint

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Bacteria The First Microbes 5 Looking Ahead On completing this chapter, you should be able to: Appreciate the enormous span of time for which bacteria have existed on Earth and understand their contributions to the formation of the world as we know it Summarize the various forms of known bacteria and define many of the submicroscopic structures associated with a bacterial cell Describe the process by which bacteria reproduce and grasp the significance of the frequency of bacterial replication Looking Ahead On completing this chapter, you should be able to: Identify some of the environments in which bacteria thrive and recognize the different types of cultivation techniques available for growing bacteria in the laboratory

Chapter 27: Bacteria and Archaea (9th Edition)

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CAMPBELL BIOLOGY, AP* 9th EDITION Chapter 27: Bacteria and Archaea 27.1 first organisms were likely prokaryotes unicellular variety of shapes - spherical, rod-shaped, and spiral well-organized the cell wall keeps it from bursting in a hypotonic solution and supports structure in hypertonic solutions, they shrink away from walls/plasmolyze contain peptidoglycan - polymer made of modified sugars crosslinked by short polypeptides. Archaea lack peptidoglycan but bacteria have it. Using the a technique called the Gram stain, scientists classify bacterial species into two ?groups based on cell wall composition Gram positive - simpler walls and a large amount of peptidoglycan Gram negative - less peptidoglycan and more structurally complex. Has an outer lipopolysaccharide membrane
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